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A non-WiFi monitor sends its video over its own radio link instead of your home network, so there is no app to install, no cloud account to create and nothing sitting on the internet for a stranger to reach. This page ranks the models that do that properly, on the things that actually decide whether they work in a real house: signal through walls, night-vision quality, battery behaviour, and what the parent unit does when you are out of range.
The full ranking for this page is being finalised. Every product listed here is checked against manufacturer specifications before it is ranked, and this page is updated as models change.